Top 10 websites to study online for free,in any device ,UpToDate .Try to study during lockdown.

hey guys as u have seen that schools are closed due to lockdown. And higher classes students should study for their future.so here I'am with the video to study online for free and a good thing is that all the websites are suitable for any device. some students couldn't afford the learning apps so they may try this.
Thankyou
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and If u find any mistakes in the video then u may comment down so I would make that better.